Add Skia includes where needed.

A proposed change in Skia will forward declare more classes in more
headers. As a result, some Skia headers need to be explicitly
included.

Change-Id: I577095afde9de0e36b8f904aee91979b01e30726
diff --git a/libs/hwui/SkiaCanvasProxy.cpp b/libs/hwui/SkiaCanvasProxy.cpp
index 811a3b0..0e51325 100644
--- a/libs/hwui/SkiaCanvasProxy.cpp
+++ b/libs/hwui/SkiaCanvasProxy.cpp
@@ -18,7 +18,11 @@
 
 #include <cutils/log.h>
 #include <SkPatchUtils.h>
+#include <SkPaint.h>
+#include <SkPath.h>
 #include <SkPixelRef.h>
+#include <SkRect.h>
+#include <SkRRect.h>
 
 namespace android {
 namespace uirenderer {